panic: kernel diagnostic assepanic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 689 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 57203 47710 0 0 0x4000000 1 syz-executor.1 47265 47710 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __assert(ffffffff81f7cec5,ffffffff81f6c058,2b1,ffffffff81f4ee5e) at __assert+0x2e sys/kern/subr_prf.c:155 proc_trampoline_mp() at proc_trampoline_mp+0x13b end trace frame: 0x0, count: 11 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 879 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __assert(ffffffff81f7cec5,ffffffff81f6c058,2b1,ffffffff81f4ee5e) at __assert+0x2e sys/kern/subr_prf.c:155 proc_trampoline_mp() at proc_trampoline_mp+0x13b end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c49cb0 rbx 0xffff800020c49d60 rdx 0xffffffff81f8b3e6 apollo_pio_rec+0x9d5d rcx 0 rax 0 r8 0xffffffff81b94ad3 kprintf+0x183 r9 0x1 r10 0x25 r11 0x3343934b2050c59c r12 0x3000000008 r13 0xffff800020c49cc0 r14 0x104 r15 0x1 rip 0xffffffff81d528d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c49ca0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=57203 stat=onproc flags process=0 proc=4000000 pri=70, usrpri=70, nice=20 forw=0xffffffffffffffff, list=0xffff800020b299e0,0xffff800020b29090 process=0xffff800020b7d080 user=0xffff800020c44000, vmspace=0xfffffd807effe2d0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 47710 85503 23561 0 2 0 syz-executor.1 *47710 57203 23561 0 7 0x4000000 syz-executor.1 47710 47265 23561 0 7 0x4000000 syz-executor.1 22972 485623 40134 0 2 0 syz-executor.0 22972 261384 40134 0 3 0x4000000 biowait syz-executor.0 22972 148761 40134 0 2 0x4000000 syz-executor.0 23561 240124 83680 0 2 0x2 syz-executor.1 40134 66379 83680 0 3 0x82 nanosleep syz-executor.0 85774 439935 1 0 3 0x100083 ttyin getty 83680 221656 85214 0 3 0x82 thrsleep syz-fuzzer 83680 186059 85214 0 3 0x4000082 thrsleep syz-fuzzer 83680 338543 85214 0 3 0x4000082 thrsleep syz-fuzzer 83680 387141 85214 0 3 0x4000082 thrsleep syz-fuzzer 83680 94092 85214 0 3 0x4000082 kqread syz-fuzzer 83680 427435 85214 0 3 0x4000082 thrsleep syz-fuzzer 83680 464534 85214 0 3 0x4000082 thrsleep syz-fuzzer 83680 139756 85214 0 3 0x4000082 thrsleep syz-fuzzer 83680 346044 85214 0 3 0x4000082 thrsleep syz-fuzzer 83680 289254 85214 0 3 0x4000082 thrsleep syz-fuzzer 85214 153141 95826 0 3 0x10008a pause ksh 95826 106544 71515 0 3 0x92 select sshd 71515 435140 1 0 3 0x80 select sshd 61216 272182 96039 74 3 0x100092 bpf pflogd 96039 419826 1 0 3 0x80 netio pflogd 42416 250249 89957 73 3 0x100090 kqread syslogd 89957 286141 1 0 3 0x100082 netio syslogd 21327 156272 1 77 3 0x100090 poll dhclient 49487 181940 1 0 3 0x80 poll dhclient 35453 332141 0 0 2 0x14200 zerothread 73461 241821 0 0 3 0x14200 aiodoned aiodoned 3309 106018 0 0 3 0x14200 syncer update 26523 475556 0 0 3 0x14200 cleaner cleaner 66832 41806 0 0 3 0x14200 reaper reaper 68424 151527 0 0 3 0x14200 pgdaemon pagedaemon 85311 407501 0 0 3 0x14200 bored crynlk 58537 274263 0 0 3 0x14200 bored crypto 86043 210955 0 0 3 0x40014200 acpi0 acpi0 71668 421084 0 0 3 0x40014200 idle1 19268 57520 0 0 3 0x14200 bored softnet 11047 351657 0 0 3 0x14200 bored systqmp 19287 414457 0 0 3 0x14200 bored systq 3185 101181 0 0 3 0x40014200 bored softclock 99739 321848 0 0 3 0x40014200 idle0 39144 52179 0 0 3 0x14200 bored smr 1 270959 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 47710 (syz-executor.1) thread 0xffff800020b284c8 (47265) exclusive rrwlock inode r = 0 (0xfffffd807ecce1b8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 _rw_enter+0x45d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vfs_lookup+0xf5 sys/kern/vfs_lookup.c:387 #6 namei+0x4b2 sys/kern/vfs_lookup.c:224 #7 unp_bind+0x1f8 sys/kern/uipc_usrreq.c:452 #8 uipc_usrreq+0x182 sys/kern/uipc_usrreq.c:131 #9 sys_bind+0x1af sys/kern/uipc_syscalls.c:187 #10 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #10 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #11 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff823e9b78) locked @ /syzkaller/managers/multicore/kernel/sys/kern/uipc_socket2.c:288 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 syscall+0x48b mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x48b sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 Process 22972 (syz-executor.0) thread 0xffff800020b28270 (261384) exclusive rrwlock inode r = 0 (0xfffffd806e5d94e8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 _rw_enter+0x45d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #4 vn_write+0x169 vn_lock sys/kern/vfs_vnops.c:549 [inline] #4 vn_write+0x169 sys/kern/vfs_vnops.c:393 #5 dofilewritev+0x1b0 sys/kern/sys_generic.c:364 #6 sys_pwritev+0xd9 sys/kern/vfs_syscalls.c:3161 #7 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #7 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #8 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9500 6407K 6423K 78643K 10785 0 0 pcb 28 10K 10K 78643K 352 0 0 rtable 100 3K 4K 78643K 393 0 0 ifaddr 53 12K 13K 78643K 135 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1477 0 0 iov 1 12K 32K 78643K 78 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1213 76K 76K 78643K 1569 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 13 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 80 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 6 17K 21K 78643K 543 0 0 sigio 0 0K 0K 78643K 10 0 0 proc 57 63K 71K 78643K 442 0 0 subproc 64 65538K 67586K 78643K 184 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 52 0 0 in_multi 33 2K 2K 78643K 84 0 0 ether_multi 1 0K 0K 78643K 5 0 0 mrt 0 0K 0K 78643K 3 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 263 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 84 20K 29K 78643K 2646 0 0 UVM aobj 36 2K 2K 78643K 40 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 18 0 0 NDP 10 0K 0K 78643K 39 0 0 temp 150 2373K 2440K 78643K 4829 0 0 kqueue 0 0K 0K 78643K 2 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 7 0 3 1 0 1 1 0 8 0 inpcbpl 280 287 0 279 1 0 1 1 0 8 0 plimitpl 152 44 0 36 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 68 0 28 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 113 0 109 1 0 1 1 0 8 0 nd6 48 10 0 6 1 0 1 1 0 8 0 ppxss 1128 15 0 15 2 2 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 19 0 12 1 0 1 1 0 8 0 pfstkey 112 19 0 12 1 0 1 1 0 8 0 pfstate 328 19 0 12 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 311 0 123 12 0 12 12 0 8 0 art_table 32 312 0 123 2 0 2 2 0 8 0 art_node 16 67 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 38 0 20 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 78 0 68 1 0 1 1 0 8 0 shmpl 112 38 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2422 0 988 47 0 47 47 0 8 0 ffsino 272 2422 0 988 96 0 96 96 0 8 0 nchpl 144 3402 0 1762 61 0 61 61 0 8 0 uvmvnodes 72 2586 0 0 48 0 48 48 0 8 0 vnodes 200 2586 0 0 137 0 137 137 0 8 0 namei 1024 9900 0 9899 1 0 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 2 0 2 2 1 1 1 0 8 1 scxspl 192 10724 0 10723 13 12 1 6 0 8 0 sigapl 432 734 0 718 2 0 2 2 0 8 0 futexpl 56 6637 0 6637 1 0 1 1 0 8 1 knotepl 112 221 0 202 1 0 1 1 0 8 0 kqueuepl 104 177 0 175 1 0 1 1 0 8 0 pipepl 112 502 0 483 3 2 1 2 0 8 0 fdescpl 488 735 0 718 4 1 3 3 0 8 0 filepl 152 4468 0 4363 6 1 5 6 0 8 0 lockfpl 104 190 0 189 2 1 1 1 0 8 0 lockfspl 32 358 0 357 2 1 1 1 0 8 0 sessionpl 112 22 0 11 1 0 1 1 0 8 0 pgrppl 48 42 0 31 1 0 1 1 0 8 0 ucredpl 96 928 0 919 1 0 1 1 0 8 0 zombiepl 144 718 0 718 2 1 1 1 0 8 1 processpl 840 750 0 718 4 0 4 4 0 8 0 procpl 600 1890 0 1845 4 0 4 4 0 8 0 srpgc 64 18 0 18 3 3 0 1 0 8 0 sockpl 384 577 0 555 3 0 3 3 0 8 0 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 127 0 0 15 0 15 15 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 155 0 0 8 0 8 8 0 8 0 bufpl 256 7023 0 1147 368 0 368 368 0 8 0 anonpl 16 99554 0 90444 74 16 58 58 0 125 18 amapchunkpl 152 4549 0 4451 17 8 9 10 0 158 4 amappl16 192 3882 0 3413 59 23 36 36 0 8 12 amappl15 184 105 0 100 1 0 1 1 0 8 0 amappl14 176 49 0 46 2 1 1 1 0 8 0 amappl13 168 31 0 27 1 0 1 1 0 8 0 amappl12 160 18 0 17 1 0 1 1 0 8 0 amappl11 152 23 0 8 1 0 1 1 0 8 0 amappl10 144 201 0 198 1 0 1 1 0 8 0 amappl9 136 907 0 900 1 0 1 1 0 8 0 amappl8 128 470 0 450 1 0 1 1 0 8 0 amappl7 120 172 0 167 1 0 1 1 0 8 0 amappl6 112 59 0 50 1 0 1 1 0 8 0 amappl5 104 123 0 109 1 0 1 1 0 8 0 amappl4 96 982 0 949 2 1 1 2 0 8 0 amappl3 88 150 0 145 1 0 1 1 0 8 0 amappl2 80 5325 0 5261 2 0 2 2 0 8 0 amappl1 72 25511 0 25040 26 16 10 20 0 8 0 amappl 72 2160 0 2122 1 0 1 1 0 75 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 39 0 4 1 0 1 1 0 8 0 uaddrrnd 24 735 0 718 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 735 0 718 1 0 1 1 0 8 0 vmmpekpl 168 10203 0 10179 2 0 2 2 0 8 0 vmmpepl 168 88532 0 86950 112 34 78 83 0 357 9 vmsppl 360 734 0 718 2 0 2 2 0 8 0 pdppl 4096 1478 0 1436 7 1 6 6 0 8 0 pvpl 32 299546 0 287062 174 27 147 147 0 265 46 pmappl 224 734 0 718 3 2 1 2 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 520 0 4 15 0 15 15 0 8 0